2166717037187 has 4 divisors (see below), whose sum is σ = 2166727611360. Its totient is φ = 2166706463016.

The previous prime is 2166717037183. The next prime is 2166717037193. The reversal of 2166717037187 is 7817307176612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166717037187 - 2² = 2166717037183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166717037183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4973528 + ... + 5391605.

It is an arithmetic number, because the mean of its divisors is an integer number (541681902840).

Almost surely, 2^{2166717037187} is an apocalyptic number.

2166717037187 is a deficient number, since it is larger than the sum of its proper divisors (10574173).

2166717037187 is a wasteful number, since it uses less digits than its factorization.

2166717037187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10574172.

The product of its (nonzero) digits is 4148928, while the sum is 56.

The spelling of 2166717037187 in words is "two trillion, one hundred sixty-six billion, seven hundred seventeen million, thirty-seven thousand, one hundred eighty-seven".